diff --git a/samples/errorfs/error_fs.go b/samples/errorfs/error_fs.go
index 7c1a315..db9e76f 100644
--- a/samples/errorfs/error_fs.go
+++ b/samples/errorfs/error_fs.go
@@ -138,3 +138,19 @@ func (fs *errorFS) LookUpInode(
 
 	return
 }
+
+// LOCKS_EXCLUDED(fs.mu)
+func (fs *errorFS) OpenFile(
+	ctx context.Context,
+	op *fuseops.OpenFileOp) (err error) {
+	if fs.transformError(op, &err) {
+		return
+	}
+
+	if op.Inode != fooInodeID {
+		err = fmt.Errorf("Unsupported inode ID: %d", op.Inode)
+		return
+	}
+
+	return
+}
diff --git a/samples/errorfs/error_fs_test.go b/samples/errorfs/error_fs_test.go
index 726ffa1..85fb500 100644
--- a/samples/errorfs/error_fs_test.go
+++ b/samples/errorfs/error_fs_test.go
@@ -66,7 +66,7 @@ func (t *ErrorFSTest) OpenFile() {
 	t.fs.SetError(reflect.TypeOf(&fuseops.OpenFileOp{}), syscall.EOWNERDEAD)
 
 	_, err := os.Open(path.Join(t.Dir, "foo"))
-	ExpectThat(err, Error(HasSubstr("TODO")))
+	ExpectThat(err, Error(MatchesRegexp("open.*: .*owner died")))
 }
 
 func (t *ErrorFSTest) ReadFile() {